German luxury carmaker Porsche is slimming down its executive committee and rearranging its supervisory board ahead of its planned IPO on Thursday. The company is reducing the supervisory board’s executive committee from eight to six members, with Hans Michel Piëch and VW supervisory board chairman Hans Dieter Pötsch planning to depart. That means the executive committee consists of VW finance chief Arno Antlitz and VW’s new board member for IT and organization, Hauke Stars, alongside Wolfgang Porsche, trade union representative Jordana Vogiatzi, and works council members Harald Buck and Carst…